int myFunction( char* s, int count) {
//do something..
return 0;
};
int main() {
myFunctionPtrType p = &myFunction; //notice the syntax here, taking the address of myFunction.
//now p can be called as if it was a function:
char s[20];
int result = p(s,20); //the call syntax is as if it was function.
std::cout << "The result of calling p was: " << result << std::endl;
};

In the example you posted, the "__cdecl" keyword is simply the calling convention of the function (like __stdcall or __fastcall). These are important when using function pointers across different modules (and possibly different original programming languages). For instance, __cdecl is the default C calling convention and is supported by many other languages, and __stdcall is a standard calling convention that is mostly used by Win32 API to make it essentially callable from any programming language.

There are several other variants of this basic concept of "pointing to a function", which include pointer to member functions, function objects, and function types. Boost.Bind and Boost.Function are libraries that exploit those very well (and, with basic knowledge of templates, they are generally easier to use than classic function pointers and the like).

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